Abstract We show that the detachment of a flat punch from viscoelastic substrate has relatively simple behaviour, framed between Kendall’s elastic solution at relaxed modulus and instantaneous modulus, cohesive strength limit. find hardly any dependence pull-off force on details loading process, including maximum indentation preload rate, resulting much simpler than case spherical punch. Pull-o...

Biological adhesive contacts are usually of hierarchical structures, such as the clustering of hundreds of sub-micrometre spatulae on keratinous hairs of gecko feet, or the clustering of molecular bonds into focal contacts in cell adhesion. When separating these interfaces, releasable adhesion can be accomplished by asymmetric alignment of the lowest scale discrete bonds (such as the inclined s...

In the present work the pull-in voltage of a micro cracked cantilever beam subjected to nonlinear electrostatic pressure was studied. Two mathematical models were employed for modeling the problem: a lumped mass model and a classical beam model. The effect of crack in the lumped mass model is the reduction of the effective stiffness of the beam and in the beam model; the crack is modeled as a m...